chore(servicequotas): Add OTEL trace

Signed-off-by: Vincent Mercier <vmercier@gmail.com>

internal/app/servicequotas/servicequotas.go

@@ -8,12 +8,16 @@ import (
 
 	aws_servicequotas "github.com/aws/aws-sdk-go-v2/service/servicequotas"
 	converter "github.com/qonto/prometheus-rds-exporter/internal/app/unit"
+	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/codes"
 	"golang.org/x/exp/slog"
 )
 
 var (
 	errNoQuota    = errors.New("no AWS quota with this code")
-	errQuotaError = errors.New("aws return error for this quota")
+	errQuotaError = errors.New("AWS return error for this quota")
+	tracer        = otel.Tracer("github/qonto/prometheus-rds-exporter/internal/app/servicequotas")
 )
 
 const (
@@ -40,13 +44,15 @@ type ServiceQuotasClient interface {
 	GetServiceQuota(ctx context.Context, input *aws_servicequotas.GetServiceQuotaInput, optFns ...func(*aws_servicequotas.Options)) (*aws_servicequotas.GetServiceQuotaOutput, error)
 }
 
-func NewFetcher(client ServiceQuotasClient) *serviceQuotaFetcher {
+func NewFetcher(ctx context.Context, client ServiceQuotasClient) *serviceQuotaFetcher {
 	return &serviceQuotaFetcher{
+		ctx:    ctx,
 		client: client,
 	}
 }
 
 type serviceQuotaFetcher struct {
+	ctx        context.Context
 	logger     *slog.Logger
 	client     ServiceQuotasClient
 	statistics Statistics
@@ -58,29 +64,44 @@ func (s *serviceQuotaFetcher) GetStatistics() Statistics {
 
 // GetQuota retrieves and returns the AWS quota value for the specified serviceCode and quotaCode
 func (s *serviceQuotaFetcher) getQuota(serviceCode string, quotaCode string) (float64, error) {
+	_, span := tracer.Start(s.ctx, "get-quota")
+	defer span.End()
+
+	span.SetAttributes(attribute.String("com.qonto.prometheus_rds_exporter.aws.quota.service_code", serviceCode), attribute.String("com.qonto.prometheus_rds_exporter.aws.quota.code", quotaCode))
+
 	params := &aws_servicequotas.GetServiceQuotaInput{
 		ServiceCode: &serviceCode,
 		QuotaCode:   &quotaCode,
 	}
 
 	s.statistics.UsageAPICall++
 
-	result, err := s.client.GetServiceQuota(context.TODO(), params)
+	result, err := s.client.GetServiceQuota(s.ctx, params)
 	if err != nil {
+		span.SetStatus(codes.Error, "failed to get quota")
+		span.RecordError(err)
+
 		return 0, fmt.Errorf("can't get %s/%s service quota: %w", serviceCode, quotaCode, err)
 	}
 
 	// AWS response payload could contains errors (eg. missing permission)
 	if result.Quota.ErrorReason != nil {
 		s.logger.Error("AWS quota error: ", "errorCode", result.Quota.ErrorReason.ErrorCode, "message", *result.Quota.ErrorReason.ErrorMessage)
+		span.SetStatus(codes.Error, "failed to fetch quota")
+		span.RecordError(errQuotaError)
 
 		return 0, errQuotaError
 	}
 
 	if result.Quota == nil {
+		span.SetStatus(codes.Error, "no quota")
+		span.RecordError(errQuotaError)
+
 		return 0, fmt.Errorf("no quota for %s/%s: %w", serviceCode, quotaCode, errNoQuota)
 	}
 
+	span.SetStatus(codes.Ok, "quota fetched")
+
 	return *result.Quota.Value, nil
 }
 

internal/app/servicequotas/servicequotas_test.go

@@ -1,6 +1,7 @@
 package servicequotas_test
 
 import (
+	"context"
 	"testing"
 
 	"github.com/qonto/prometheus-rds-exporter/internal/app/servicequotas"
@@ -12,9 +13,10 @@ import (
 )
 
 func TestGetRDSQuotas(t *testing.T) {
+	context := context.TODO()
 	client := mock.ServiceQuotasClient{}
 
-	result, err := servicequotas.NewFetcher(client).GetRDSQuotas()
+	result, err := servicequotas.NewFetcher(context, client).GetRDSQuotas()
 	require.NoError(t, err, "GetRDSQuotas must succeed")
 	assert.Equal(t, mock.DBinstancesQuota, result.DBinstances, "DbInstance quota is incorrect")
 	assert.Equal(t, converter.GigaBytesToBytes(mock.TotalStorage), result.TotalStorage, "Total storage quota is incorrect")